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| 1 | <?php |
| 2 | /** |
| 3 | * Stats in the WordPress admin bar. |
| 4 | * |
| 5 | * @package automattic/jetpack-stats-admin |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Stats_Admin; |
| 9 | |
| 10 | use Automattic\Jetpack\Connection\Client; |
| 11 | use Automattic\Jetpack\Constants; |
| 12 | use Automattic\Jetpack\Stats\Options as Stats_Options; |
| 13 | use Automattic\Jetpack\Status\Host; |
| 14 | |
| 15 | /** |
| 16 | * Adds the views chart and a Stats link to the admin bar. |
| 17 | */ |
| 18 | class Admin_Bar { |
| 19 | /** |
| 20 | * The admin bar charts WordPress.com draws, at 1x and 2x. |
| 21 | * |
| 22 | * @var string[] |
| 23 | */ |
| 24 | const CHARTS = array( 'admin-bar-hours-scale', 'admin-bar-hours-scale-2x' ); |
| 25 | |
| 26 | /** |
| 27 | * The admin-post.php action that serves a chart. |
| 28 | * |
| 29 | * @var string |
| 30 | */ |
| 31 | const CHART_ACTION = 'jetpack_stats_admin_bar_chart'; |
| 32 | |
| 33 | /** |
| 34 | * Register the hooks. |
| 35 | * |
| 36 | * @return void |
| 37 | */ |
| 38 | public static function init() { |
| 39 | add_action( 'admin_bar_menu', array( __CLASS__, 'maybe_add_chart_node' ), 100 ); |
| 40 | add_action( 'admin_bar_init', array( __CLASS__, 'maybe_add_chart' ) ); |
| 41 | add_action( 'wp_before_admin_bar_render', array( __CLASS__, 'add_site_menu_link' ) ); |
| 42 | add_action( 'admin_init', array( __CLASS__, 'maybe_serve_chart' ), 1 ); |
| 43 | add_action( 'admin_post_' . self::CHART_ACTION, array( __CLASS__, 'serve_chart' ) ); |
| 44 | add_filter( 'pre_option_db_version', array( __CLASS__, 'ignore_db_version' ) ); |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Whether the current user should see the views chart. |
| 49 | * |
| 50 | * @return bool |
| 51 | */ |
| 52 | private static function can_see_chart() { |
| 53 | return is_user_logged_in() && Stats_Options::get_option( 'admin_bar' ) && current_user_can( 'view_stats' ); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Add the views chart when the current user should see it. |
| 58 | * |
| 59 | * Hooked to admin_bar_menu because a REST request fires no page head, and the admin-bar endpoint needs this node. |
| 60 | * |
| 61 | * @param \WP_Admin_Bar $wp_admin_bar The admin bar. |
| 62 | * @return void |
| 63 | */ |
| 64 | public static function maybe_add_chart_node( $wp_admin_bar ) { |
| 65 | if ( self::can_see_chart() ) { |
| 66 | self::add_chart_node( $wp_admin_bar ); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Add the views chart styles to the admin bar stylesheet when the current user should see the chart. |
| 72 | * |
| 73 | * @return void |
| 74 | */ |
| 75 | public static function maybe_add_chart() { |
| 76 | if ( ! self::can_see_chart() ) { |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | wp_add_inline_style( |
| 81 | 'admin-bar', |
| 82 | '#wpadminbar .quicklinks li#wp-admin-bar-stats { height: 32px; } |
| 83 | #wpadminbar .quicklinks li#wp-admin-bar-stats a { height: 32px; padding: 0; } |
| 84 | #wpadminbar .quicklinks li#wp-admin-bar-stats a div { height: 32px; width: 95px; overflow: hidden; margin: 0 10px; } |
| 85 | #wpadminbar .quicklinks li#wp-admin-bar-stats a:hover div { width: auto; margin: 0 8px 0 10px; } |
| 86 | #wpadminbar .quicklinks li#wp-admin-bar-stats a img { height: 24px; margin: 4px 0; max-width: none; border: none; }' |
| 87 | ); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Add the views chart, linked to the Stats dashboard. |
| 92 | * |
| 93 | * @param \WP_Admin_Bar $wp_admin_bar The admin bar. |
| 94 | * @return void |
| 95 | */ |
| 96 | public static function add_chart_node( $wp_admin_bar ) { |
| 97 | $img_src = esc_attr( self::get_chart_src( 'admin-bar-hours-scale' ) ); |
| 98 | $img_src_2x = esc_attr( self::get_chart_src( 'admin-bar-hours-scale-2x' ) ); |
| 99 | $alt = esc_attr__( 'Stats', 'jetpack-stats-admin' ); |
| 100 | $title = esc_attr__( 'Views over 48 hours. Click for more Jetpack Stats.', 'jetpack-stats-admin' ); |
| 101 | |
| 102 | $wp_admin_bar->add_menu( |
| 103 | array( |
| 104 | 'id' => 'stats', |
| 105 | 'href' => self::get_dashboard_url(), |
| 106 | 'title' => "<div><img fetchpriority='low' loading='lazy' decoding='async' src='$img_src' srcset='$img_src 1x, $img_src_2x 2x' width='112' height='24' alt='$alt' title='$title'></div>", |
| 107 | // A client that reads the admin bar as data, like the omnibar, shows this instead of the image markup. |
| 108 | 'meta' => array( 'menu_title' => __( 'Stats', 'jetpack-stats-admin' ) ), |
| 109 | ) |
| 110 | ); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Add a Stats link to the site-name menu, next to Dashboard. |
| 115 | * |
| 116 | * @return void |
| 117 | */ |
| 118 | public static function add_site_menu_link() { |
| 119 | global $wp_admin_bar; |
| 120 | |
| 121 | // WordPress.com adds its own Stats link to this menu. |
| 122 | if ( |
| 123 | ! is_object( $wp_admin_bar ) || |
| 124 | ! $wp_admin_bar->get_node( 'dashboard' ) || |
| 125 | ! current_user_can( 'view_stats' ) || |
| 126 | ( new Host() )->is_wpcom_platform() |
| 127 | ) { |
| 128 | return; |
| 129 | } |
| 130 | |
| 131 | $wp_admin_bar->add_node( |
| 132 | array( |
| 133 | 'parent' => 'site-name', |
| 134 | 'id' => 'jetpack-stats', |
| 135 | 'title' => __( 'Stats', 'jetpack-stats-admin' ), |
| 136 | 'href' => self::get_dashboard_url(), |
| 137 | ) |
| 138 | ); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Where the admin bar's Stats links go. |
| 143 | * |
| 144 | * @return string |
| 145 | */ |
| 146 | private static function get_dashboard_url() { |
| 147 | /** |
| 148 | * Filters a link to a Stats page, so a newer analytics dashboard can claim it. |
| 149 | * |
| 150 | * `$args['view']` names the page the link opens: `dashboard`, or `post` with the post in `$args['id']`. |
| 151 | * Return `$url` unchanged for a view the dashboard has no page for. |
| 152 | * |
| 153 | * @since 0.39.0 |
| 154 | * |
| 155 | * @param string $url The Stats URL. |
| 156 | * @param array $args The page the link opens. |
| 157 | */ |
| 158 | return apply_filters( 'jetpack_stats_url', admin_url( 'admin.php?page=stats' ), array( 'view' => 'dashboard' ) ); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Get the local URL that serves a chart image. |
| 163 | * |
| 164 | * Served by admin-post.php, because admin.php returns 403 for a page slug no plugin registers. |
| 165 | * |
| 166 | * @param string $chart One of the CHARTS. |
| 167 | * @return string |
| 168 | */ |
| 169 | public static function get_chart_src( $chart ) { |
| 170 | return add_query_arg( |
| 171 | array( |
| 172 | 'action' => self::CHART_ACTION, |
| 173 | 'chart' => $chart, |
| 174 | ), |
| 175 | admin_url( 'admin-post.php' ) |
| 176 | ); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Serve the chart an admin-post.php request asks for, or end it with an error status. |
| 181 | * |
| 182 | * @since $$next-version$$ |
| 183 | * |
| 184 | * @return void |
| 185 | */ |
| 186 | public static function serve_chart() { |
| 187 | $chart = self::get_chart_param(); |
| 188 | if ( null === $chart ) { |
| 189 | wp_die( '', '', 400 ); |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | if ( ! self::can_see_chart() ) { |
| 194 | wp_die( '', '', 403 ); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | self::send_chart( $chart ); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Serve a chart and stop, when a legacy `admin.php?page=stats` request asks for one. |
| 203 | * |
| 204 | * @return void |
| 205 | */ |
| 206 | public static function maybe_serve_chart() { |
| 207 | // URLs with `proxy` come from the Jetpack plugin's deprecated stats_get_image_chart_src(), and its own handler forwards their extra parameters. |
| 208 | if ( isset( $_GET['proxy'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- An image request carries no nonce, and it changes nothing. |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | $chart = self::get_requested_chart(); |
| 213 | if ( null === $chart || ! self::can_see_chart() ) { |
| 214 | return; |
| 215 | } |
| 216 | |
| 217 | self::send_chart( $chart ); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Send a chart image fetched from WordPress.com, and stop. |
| 222 | * |
| 223 | * The browser cannot fetch the chart from WordPress.com directly, because only the blog token can read it. |
| 224 | * |
| 225 | * @param string $chart One of the CHARTS. |
| 226 | * @return never |
| 227 | */ |
| 228 | private static function send_chart( $chart ) { |
| 229 | $image = self::fetch_chart( $chart ); |
| 230 | if ( null === $image ) { |
| 231 | status_header( 502 ); |
| 232 | exit( 0 ); |
| 233 | } |
| 234 | |
| 235 | header( 'Content-Type: ' . $image['type'] ); |
| 236 | header( 'Content-Length: ' . strlen( $image['body'] ) ); |
| 237 | echo $image['body']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Binary image data. |
| 238 | exit( 0 ); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Fetch a chart image from WordPress.com with the blog token. |
| 243 | * |
| 244 | * @param string $chart One of the CHARTS. |
| 245 | * @return array{type: string, body: string}|null The image, or null when WordPress.com did not return one. |
| 246 | */ |
| 247 | public static function fetch_chart( $chart ) { |
| 248 | $server = Constants::get_constant( 'STATS_DASHBOARD_SERVER' ) ?? 'dashboard.wordpress.com'; |
| 249 | |
| 250 | // WordPress.com accepts the blog token on this file only when `page`, `proxy` and `blog` are all present. |
| 251 | $url = add_query_arg( |
| 252 | array( |
| 253 | 'page' => 'stats', |
| 254 | 'proxy' => '', |
| 255 | 'blog' => Stats_Options::get_option( 'blog_id' ), |
| 256 | ), |
| 257 | "https://{$server}/wp-includes/charts/{$chart}.php" |
| 258 | ); |
| 259 | |
| 260 | $response = Client::remote_request( |
| 261 | array( |
| 262 | 'url' => $url, |
| 263 | 'method' => 'GET', |
| 264 | 'timeout' => 90, |
| 265 | 'user_id' => 0, |
| 266 | ) |
| 267 | ); |
| 268 | |
| 269 | // A failed request has the code '', which PHP 8 cannot divide. |
| 270 | $code = (int) wp_remote_retrieve_response_code( $response ); |
| 271 | $type = wp_remote_retrieve_header( $response, 'content-type' ); |
| 272 | $body = wp_remote_retrieve_body( $response ); |
| 273 | if ( 2 !== (int) ( $code / 100 ) || ! is_string( $type ) || ! str_starts_with( $type, 'image/' ) || '' === $body ) { |
| 274 | return null; |
| 275 | } |
| 276 | |
| 277 | return array( |
| 278 | 'type' => $type, |
| 279 | 'body' => $body, |
| 280 | ); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Keep chart requests from redirecting to upgrade.php while a database upgrade is pending. |
| 285 | * |
| 286 | * @see wp-admin/admin.php, which compares the stored `db_version` with `$wp_db_version`. |
| 287 | * |
| 288 | * @param mixed $version The stored database version. |
| 289 | * @return mixed |
| 290 | */ |
| 291 | public static function ignore_db_version( $version ) { |
| 292 | if ( is_admin() && null !== self::get_requested_chart() ) { |
| 293 | global $wp_db_version; |
| 294 | return $wp_db_version; |
| 295 | } |
| 296 | |
| 297 | return $version; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Get the chart a legacy `page=stats` request asks for. |
| 302 | * |
| 303 | * @return string|null One of the CHARTS, or null when the request is not a `page=stats` chart request. |
| 304 | */ |
| 305 | private static function get_requested_chart() { |
| 306 | if ( ! isset( $_GET['page'] ) || 'stats' !== $_GET['page'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- An image request carries no nonce, and it changes nothing. |
| 307 | return null; |
| 308 | } |
| 309 | |
| 310 | return self::get_chart_param(); |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Get the chart in the request's `chart` parameter. |
| 315 | * |
| 316 | * @return string|null One of the CHARTS, or null when the parameter names none. |
| 317 | */ |
| 318 | private static function get_chart_param() { |
| 319 | // phpcs:disable WordPress.Security.NonceVerification.Recommended -- An image request carries no nonce, and it changes nothing. |
| 320 | if ( ! isset( $_GET['chart'] ) ) { |
| 321 | return null; |
| 322 | } |
| 323 | |
| 324 | $chart = sanitize_key( wp_unslash( $_GET['chart'] ) ); |
| 325 | // phpcs:enable WordPress.Security.NonceVerification.Recommended |
| 326 | |
| 327 | return in_array( $chart, self::CHARTS, true ) ? $chart : null; |
| 328 | } |
| 329 | } |